Approximately, the probability of catching a Pokémon starts with the
species' catch rate divided by 255. Then it is multiplied by the
following factors:
- The health of the Pokémon (relative to its full
health), which can reduce the probability to ⅓× at full health
- The type of Poké Ball, which can augment by some ×
- Any status ailment of the wild Pokémon (i.e. 2× increase for sleep or freeze, and 1.5× for
others).